<h1 id="rev">rev</h1>
<p>将文件内容以字符为单位反序输出</p>
<h2 id="补充说明">补充说明</h2>
<p><strong>rev命令</strong> 将文件中的每行内容以字符为单位反序输出，即第一个字符最后输出，最后一个字符最先输出，依次类推。</p>
<h3 id="语法">语法</h3>
<pre><code class="language-bash">rev(参数)</code></pre>
<h3 id="参数">参数</h3>
<p>文件：指定要反序显示内容的文件。</p>
<h3 id="实例">实例</h3>
<pre><code class="language-bash">[root@localhost ~]# cat iptables.bak
# Generated by iptables-save v1.3.5 on Thu Dec 26 21:25:15 2013
*filter
:INPUT DROP [48113:2690676]
:FORWARD accept [0:0]
:OUTPUT ACCEPT [3381959:1818595115]
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A OUTPUT -o lo -j ACCEPT
COMMIT
# Completed on Thu Dec 26 21:25:15 2013

[root@localhost ~]# rev iptables.bak 
3102 51:52:12 62 ceD uhT no 5.3.1v evas-selbatpi yb detareneG #
retlif*
]6760962:31184[ PORD TUPNI:
]0:0[ TPECCA DRAWROF:
]5115958181:9591833[ TPECCA TUPTUO:
 TPECCA j- ol i- TUPNI A-
 TPECCA j- 22 tropd-- pct m- pct p- TUPNI A-
 TPECCA j- 08 tropd-- pct m- pct p- TUPNI A-
 TPECCA j- DEHSILBATSE,DETALER etats-- etats m- TUPNI A-
 TPECCA j- pmci p- TUPNI A-
 TPECCA j- ol o- TUPTUO A-
TIMMOC
3102 51:52:12 62 ceD uhT no detelpmoC #</code></pre>
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